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<div class="title">src/ca/uqac/dim/turtledb/Product.java</div>  </div>
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<a href="_product_8java.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*-------------------------------------------------------------------------</span>
<a name="l00002"></a>00002 <span class="comment">    Simple distributed database engine</span>
<a name="l00003"></a>00003 <span class="comment">    Copyright (C) 2012  Sylvain Hallé</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment">    This program is free software: you can redistribute it and/or modify</span>
<a name="l00006"></a>00006 <span class="comment">    it under the terms of the GNU General Public License as published by</span>
<a name="l00007"></a>00007 <span class="comment">    the Free Software Foundation, either version 3 of the License, or</span>
<a name="l00008"></a>00008 <span class="comment">    (at your option) any later version.</span>
<a name="l00009"></a>00009 <span class="comment"></span>
<a name="l00010"></a>00010 <span class="comment">    This program is distributed in the hope that it will be useful,</span>
<a name="l00011"></a>00011 <span class="comment">    but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00012"></a>00012 <span class="comment">    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the</span>
<a name="l00013"></a>00013 <span class="comment">    GNU General Public License for more details.</span>
<a name="l00014"></a>00014 <span class="comment"></span>
<a name="l00015"></a>00015 <span class="comment">    You should have received a copy of the GNU General Public License</span>
<a name="l00016"></a>00016 <span class="comment">    along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;.</span>
<a name="l00017"></a>00017 <span class="comment"> -------------------------------------------------------------------------*/</span>
<a name="l00018"></a>00018 <span class="keyword">package </span>ca.uqac.dim.turtledb;
<a name="l00019"></a>00019 
<a name="l00020"></a>00020 <span class="keyword">import</span> java.util.Iterator;
<a name="l00021"></a>00021 
<a name="l00022"></a>00022 <span class="keyword">import</span> ca.uqac.dim.turtledb.QueryVisitor.VisitorException;
<a name="l00023"></a>00023 
<a name="l00024"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product.html">00024</a> <span class="keyword">public</span> <span class="keyword">class </span><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product.html">Product</a> <span class="keyword">extends</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation.html">NAryRelation</a>
<a name="l00025"></a>00025 { 
<a name="l00026"></a>00026   @Override
<a name="l00027"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product.html#a9f04b8b99df3a1c9310740bced83ebb2">00027</a>   <span class="keyword">public</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_schema.html">Schema</a> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product.html#a9f04b8b99df3a1c9310740bced83ebb2">getSchema</a>()
<a name="l00028"></a>00028   {
<a name="l00029"></a>00029     <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_schema.html">Schema</a> sch = <span class="keyword">new</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_schema.html">Schema</a>();
<a name="l00030"></a>00030     <span class="keywordflow">for</span> (<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation.html">Relation</a> r : <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation.html#aed20a0eb0271434efde6557d9d1064f9">m_relations</a>)
<a name="l00031"></a>00031     {
<a name="l00032"></a>00032       <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_schema.html">Schema</a> s = r.getSchema();
<a name="l00033"></a>00033       sch.addAll(s);
<a name="l00034"></a>00034     }
<a name="l00035"></a>00035     <span class="keywordflow">return</span> sch;
<a name="l00036"></a>00036   }
<a name="l00037"></a>00037   
<a name="l00038"></a>00038 
<a name="l00039"></a>00039   @Override
<a name="l00040"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product.html#aa52c72097e9413f0071fa4dc9df9d7db">00040</a>   <span class="keyword">public</span> <span class="keywordtype">void</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product.html#aa52c72097e9413f0071fa4dc9df9d7db">accept</a>(<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_query_visitor.html">QueryVisitor</a> v) <span class="keywordflow">throws</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_query_visitor_1_1_visitor_exception.html">VisitorException</a>
<a name="l00041"></a>00041   {
<a name="l00042"></a>00042     super.acceptNAry(v);
<a name="l00043"></a>00043     v.visit(<span class="keyword">this</span>);
<a name="l00044"></a>00044   }
<a name="l00045"></a>00045   
<a name="l00046"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product_1_1_product_stream_iterator.html">00046</a>   <span class="keyword">protected</span> <span class="keyword">class </span><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product_1_1_product_stream_iterator.html">ProductStreamIterator</a> <span class="keyword">extends</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation_1_1_n_ary_relation_stream_iterator.html">NAryRelationStreamIterator</a>
<a name="l00047"></a>00047   {
<a name="l00048"></a>00048     @Override
<a name="l00049"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product_1_1_product_stream_iterator.html#abdfd330869374ad6c52e76964716f8dc">00049</a>     <span class="keyword">protected</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product_1_1_product_stream_iterator.html#abdfd330869374ad6c52e76964716f8dc">internalNext</a>()
<a name="l00050"></a>00050     { 
<a name="l00051"></a>00051       <span class="keywordflow">if</span> (<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation_1_1_n_ary_relation_stream_iterator.html#a5c40cbb95833401d26f431d326eb01d3">m_first</a>)
<a name="l00052"></a>00052       {
<a name="l00053"></a>00053         <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation_1_1_n_ary_relation_stream_iterator.html#a5c40cbb95833401d26f431d326eb01d3">m_first</a> = <span class="keyword">false</span>;
<a name="l00054"></a>00054         super.initializeIteration();
<a name="l00055"></a>00055       }
<a name="l00056"></a>00056       <span class="keywordflow">else</span>
<a name="l00057"></a>00057       {  
<a name="l00058"></a>00058         <span class="keywordtype">int</span> len = <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation.html#aed20a0eb0271434efde6557d9d1064f9">m_relations</a>.size();
<a name="l00059"></a>00059         <span class="comment">// Update m_lastTuple by &quot;incrementing&quot; the vector</span>
<a name="l00060"></a>00060         <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = len - 1; i &gt;= 0; i--)
<a name="l00061"></a>00061         {
<a name="l00062"></a>00062           <a class="code" href="interfaceca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_iterator.html">RelationIterator</a> r = <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation_1_1_n_ary_relation_stream_iterator.html#a4cebdfbc50ada362e6f80c5c95128a02">m_iterators</a>.get(i);
<a name="l00063"></a>00063           <span class="keywordflow">if</span> (r.hasNext())
<a name="l00064"></a>00064           {
<a name="l00065"></a>00065             <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a> t = r.next();
<a name="l00066"></a>00066             assert t != null;
<a name="l00067"></a>00067             <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation_1_1_n_ary_relation_stream_iterator.html#ade56bb547d8596cb8e923dcd727717a3">m_lastTuple</a>.setElementAt(t, i);
<a name="l00068"></a>00068             <span class="keywordflow">break</span>;
<a name="l00069"></a>00069           }
<a name="l00070"></a>00070           <span class="keywordflow">else</span>
<a name="l00071"></a>00071           {
<a name="l00072"></a>00072             <span class="keywordflow">if</span> (i == 0)
<a name="l00073"></a>00073               <span class="keywordflow">return</span> null; <span class="comment">// We exhausted the iteration</span>
<a name="l00074"></a>00074             r.<a class="code" href="interfaceca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_iterator.html#ab21d5ba5f7f5a922d6a70522d774fd72">reset</a>();
<a name="l00075"></a>00075             assert r.hasNext();
<a name="l00076"></a>00076             <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a> t = r.next();
<a name="l00077"></a>00077             assert t != null;
<a name="l00078"></a>00078             <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation_1_1_n_ary_relation_stream_iterator.html#ade56bb547d8596cb8e923dcd727717a3">m_lastTuple</a>.setElementAt(t, i);
<a name="l00079"></a>00079           }
<a name="l00080"></a>00080         }
<a name="l00081"></a>00081       }
<a name="l00082"></a>00082       <span class="keywordflow">return</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a>.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html#abf66ad4658f532ec40f83a61bde8b837">makeTuple</a>(<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation_1_1_n_ary_relation_stream_iterator.html#ade56bb547d8596cb8e923dcd727717a3">m_lastTuple</a>);
<a name="l00083"></a>00083     }
<a name="l00084"></a>00084   }
<a name="l00085"></a>00085 
<a name="l00086"></a>00086   @Override
<a name="l00087"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product.html#a94dbff28938f8769bc737a49241259d1">00087</a>   <span class="keyword">public</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_stream_iterator.html">RelationStreamIterator</a> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product.html#a94dbff28938f8769bc737a49241259d1">streamIterator</a>()
<a name="l00088"></a>00088   {
<a name="l00089"></a>00089     <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product_1_1_product_stream_iterator.html">ProductStreamIterator</a>();
<a name="l00090"></a>00090   }
<a name="l00091"></a>00091 
<a name="l00092"></a>00092 
<a name="l00093"></a>00093   @Override
<a name="l00094"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product.html#a61d7f27d36f13e9edc315d32cf48ee67">00094</a>   <span class="keyword">public</span> <a class="code" href="interfaceca_1_1uqac_1_1dim_1_1turtledb_1_1_relation_iterator.html">RelationIterator</a> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product.html#a61d7f27d36f13e9edc315d32cf48ee67">cacheIterator</a>()
<a name="l00095"></a>00095   {
<a name="l00096"></a>00096     <span class="keywordflow">return</span> <span class="keyword">new</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product_1_1_product_cache_iterator.html">ProductCacheIterator</a>();
<a name="l00097"></a>00097   }
<a name="l00098"></a>00098   
<a name="l00099"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product_1_1_product_cache_iterator.html">00099</a>   <span class="keyword">protected</span> <span class="keyword">class </span><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product_1_1_product_cache_iterator.html">ProductCacheIterator</a> <span class="keyword">extends</span> NAryRelationCacheIterator
<a name="l00100"></a>00100   {
<a name="l00101"></a>00101 
<a name="l00102"></a>00102     @Override
<a name="l00103"></a><a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product_1_1_product_cache_iterator.html#afe5f2e3fbcbded22e3a484912ae1e139">00103</a>     <span class="keyword">protected</span> <span class="keywordtype">void</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product_1_1_product_cache_iterator.html#afe5f2e3fbcbded22e3a484912ae1e139">getIntermediateResult</a>()
<a name="l00104"></a>00104     {
<a name="l00105"></a>00105       <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_table.html">Table</a> tab_out = <span class="keyword">new</span> <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_table.html">Table</a>(<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_product.html#a9f04b8b99df3a1c9310740bced83ebb2">getSchema</a>());
<a name="l00106"></a>00106       super.getIntermediateResult();
<a name="l00107"></a>00107       super.initializeIteration();
<a name="l00108"></a>00108       <span class="keywordtype">boolean</span> in = <span class="keyword">true</span>;
<a name="l00109"></a>00109       <span class="keywordflow">while</span> (in)
<a name="l00110"></a>00110       {
<a name="l00111"></a>00111         <span class="keywordtype">int</span> len = <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_n_ary_relation.html#aed20a0eb0271434efde6557d9d1064f9">m_relations</a>.size();
<a name="l00112"></a>00112         <span class="comment">// Update m_lastTuple by &quot;incrementing&quot; the vector</span>
<a name="l00113"></a>00113         <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = len - 1; i &gt;= 0; i--)
<a name="l00114"></a>00114         {
<a name="l00115"></a>00115           <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_table.html">Table</a> tab = m_results.get(i);
<a name="l00116"></a>00116           Iterator&lt;Tuple&gt; r = m_iterators.get(i);
<a name="l00117"></a>00117           <span class="keywordflow">if</span> (r.hasNext())
<a name="l00118"></a>00118           {
<a name="l00119"></a>00119             <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a> t = r.next();
<a name="l00120"></a>00120             assert t != null;
<a name="l00121"></a>00121             m_lastTuple.setElementAt(t, i);
<a name="l00122"></a>00122             <span class="keywordflow">break</span>;
<a name="l00123"></a>00123           }
<a name="l00124"></a>00124           <span class="keywordflow">else</span>
<a name="l00125"></a>00125           {
<a name="l00126"></a>00126             <span class="keywordflow">if</span> (i == 0)
<a name="l00127"></a>00127             {
<a name="l00128"></a>00128               in = <span class="keyword">false</span>;
<a name="l00129"></a>00129               <span class="keywordflow">break</span>;
<a name="l00130"></a>00130             }
<a name="l00131"></a>00131             r = tab.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_table.html#a19846d1f280e9a8658a751b5b6e23bf6">tupleIterator</a>();
<a name="l00132"></a>00132             m_iterators.setElementAt(r, i);
<a name="l00133"></a>00133             assert r.hasNext();
<a name="l00134"></a>00134             <a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a> t = r.next();
<a name="l00135"></a>00135             assert t != null;
<a name="l00136"></a>00136             m_lastTuple.setElementAt(t, i);
<a name="l00137"></a>00137           }
<a name="l00138"></a>00138         }
<a name="l00139"></a>00139         tab_out.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_table.html#ac72d81075238b6f6e8406714a12156ff">put</a>(<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html">Tuple</a>.<a class="code" href="classca_1_1uqac_1_1dim_1_1turtledb_1_1_tuple.html#abf66ad4658f532ec40f83a61bde8b837">makeTuple</a>(m_lastTuple));
<a name="l00140"></a>00140       }
<a name="l00141"></a>00141       m_intermediateResult = tab_out;
<a name="l00142"></a>00142     }
<a name="l00143"></a>00143     
<a name="l00144"></a>00144   }
<a name="l00145"></a>00145 }
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